The full version of the original Angry Birds is free right now for iOS devices as part of Apple’s ‘App of the Week’ promotion.
This is actually the first time the full version is available as a free download. Typically, free versions of the app are locked or just released in an incomplete form intended to hook the player with hopes that they will purchase the full game.
Angry Birds is addictive, but I definitely feel that when you’ve played one you’ve played them all. There are new features here and there, but the main idea is the same.
That said, if you’re interested in playing, you can check it out at the App Store while it’s free.